Electric sad-iron.



' No. 876,639. PATENTED JAN. 14, 1908.

I W. M. HARWOOD.

ELECTRIC SAD IRON.

APPLICATION FILED MAY27,1907. I

53 I l i 51 nuentoz WILLARD M. HARWOOD, OF ONTARIO, CALIFORNIA.

ELECTRIC sen-men.

Specification of Letters Iatent.

Eatented Jan. 14, 1908.

Application filed May 27I 1907. Serial No. 375911- To all whom it may concern:

Be itknown that I, W'rLL nn M.- HAR- wooD, a citizen of the United States of America, and resident of Ontario, 'in the county of San Bernardino, inthe State of California, have invented certain new and useful Improvements in Electric Sad-Irons, of which the following is a specification. This invention relates to certain new and useful improvements inelectric heaters, or electrically heated apparatus, and while designed primarily for sad irons, it is evident that the same principle may be employed in other electrically heated devices, among which may be named stoves and soldering irons. The present description will however be confined to a sad iron.

The invention has for its objects among others to provide an improved device of this eneral character in which rovision is made or the direct conveyance o more heat to the toe and heel of the iron than to the sole, be cause the toe first comes in contact with the wet cloth and, being exposed, radiates heat faster than the sole. I aim to thus furnishthe necessary extra heat to the toe and heel and still maintain the sole at a uniform temperature. By providing for direct radiation from the core to the toe and heel the iron can be maintained at a workin temperature with a smaller consumption 0? current than where the radiation is less direct.

I aim further at simplicity in construction, ready assemblage of the parts and more satisfactory results n use.

Other objects and advantages of the in vention will hereinafter appear, and the novel features thereof will be specifically derined bytheappended claims.

The invention is clearly illustrated in the accompanying. drawings, which, with the numerals of reference marked thereon, form a part of this specification, and in which Figure 1 is a substantially central vertical longitudinal section through my improved sad iron, as on the line 1-1 of Fig. 2. Fig. 2 is a top plan with the cover removed, showing the interior. Fig. 3 is a verticalcross section as on the line 3 3 of Fig. 2.

Like numerals of reference indicate like parts throughout the several views.

Referring 'to the drawings 1 designates the body of the iron having screw threaded openings 2 to receive the screws 3 which serve to removably retain in osition the cover 4, upon the under side 0 which is a wire 18.

connected, as by twisting together as seen,

sheet of non-heat conducting material5 as seen best in Fig. 1. Y

6 is a bail secured to the cover by suitable means as a screw 7, said cover being shown as provided, upon each side of the said screw, with a raised portion 8 having a depression 9 into which are received the projections or points 10 on the under side of the bail as shown in Fig. 1 to steady the bail. A suitable handle 11 is secured to this bail by suitable means, as the screws 12, seeFig. 1. The body 1 is chambered as shown and is rovided upon its side Walls with flat suraces 13. Upon these flat surfaces, and also upon the bottom of the body are placed thin strips of insulating material 14 and 15 respectively as seen-best in Fig. 3, to pre vent contact of the Wire of the cores with the body of the iron.v I

'l'he heating element consists of the two cores 16, 16 each of which is wound or covered with a thin sheet of insulating material 17, as mica. Woundupon this mica is a The wires of the two cores are at 19 near the toe as shown in Fig. 2.. The rear ends of these wires are suitably connected to the binding posts 21 and 22, as seen best in Fig. 2, which binding posts are insulated from the body of the iron through which they pass, by the mica washers and 23 as seen in Fig. 2. The cores are by preference of substantia ly triangular shape as seen in. Fig. 3. v i

The heaters or cores are held in place detachably by means of the plate or bar 24 having the inclined side portions 25 forming a wedge which bears at its sides against the cores and forces them against the flat sides and bottom of the iron body, as will be best seen from Fig. 3, the said plate or bar being held in place by a screw 26 en gaging a screw threaded socket in the boss 27 on the inner wall of the bottom of the iron.

28 is insulating material placed between the sides of the wedge and the wires of the heaters.

29 is a sheet of insulating material above the heaters and held in place by the cover, the asbestos layer 5 resting upon this sheet of insulating material as seen in Figs. 1 and 3.

In use, the electrical connections being made with the binding posts in the usual manner, the current passes through the resistance wires 18 and the heat generated is was i Q l radiated through the the wire to the bottom and flat portions ofage of-the heat by means oi ,'lhe cores are wound I length so as to b rlng t the body, Thus the sole is heated toa uniform-temperature throughout, while the toe- 'and heel'portions receive a greater percentthe extra contact along the fiat portions of the sides. practically the whole e resistance wlres as near the point of the-iron aspossible as well as to the heel, and direct radiation, of the heat-to those parts assured.

The above construction embodies the acme of simplicity and no machine Work 1s re? qulredto obtain contact between-the heat ers and the body of the iron, and While the that the same structural einbo'dimentof the invention as hereinbefore described is what I attheQ resent time, consider preferable, it is evident any of its advantages; I thereforedongitihtend to restrict m'yselfto, thee roportionsof parts 'orjpther'. eatures, but reserve. the 11ghtt eke such changes, variations ands-moms tions as come properly tection prayed claims.

-' What is claimed asn'e'Wisr-e:v

within the qieeiaae w -1. In a device-ofthe character described, a body, heaters therein tlndfloose ly supported. and disconnected h'om'saidbed and extending substantially to-the toe an =constructed to radiate-the'heat directly to the J toe "and heel of-rthe body and: means inde cured to the. bottom for e pendent of the, cover inplace. Y 2. In a device of the character described a body, cores therein, insulating material covering the" cores and wireswound upon said nsulation and extending the entire length thereof to ring the same f well into the toe of the bodyand means connected to the bottom of the body and pressmg laterally against said cores to keep them in place.

mica strips covering l is subject to changes, varia- 'tions and modificationsfwitliout departing from'the spirit'of theinvent'ion or sacrificing.

t-details j 6;An electric sad I toe, a We as stated an the appended "forci and detachably seholding said heaters substantially.

between said cores and-secured to the bot tom of said body for holding the cores in .ace. 5. In a device of the character described, a chamberedbody, cores-therein wound substantiall'y'their whole length, insulation be-' tween the wires and the, 'coresandbetween the wires and thel-wallsof the body, and a- Ielnovable Wedge interposed between said coresand securedto the bottom of said o'fthe body. t

bered bod cores therein extending into the.

bottom an sides'of' the body,- insulation between the cores and wedge'and between the cores and the sides and a cover, and insulating same andthe cores. 7. An electric sad iron, com'pri chambered body, cores therein .exten 111170 the toe and contacting with the side vWall's of the'chamber of the 0d means for the cores against the si tom-0 thechamber, insulation between the I wire disposed Witl'd'n insulating material between the the walls-of the body, and an i isulatedswedg'e securing device interposed w. bodyfOr holding the cores place and for forcing the cores upon the bottom and sides 7 iron comprising achanh (g'e-for forcing the cores upon the.

bottom of the body, material between the esandboteores'and securing'means and between the cores and the Walls andbottom of the cham- L her, an 7 insulating j strip overthe cores, '8.

cover, and-a non-conducting strip between the same and said 'insulatin stri i Si ned by'nie at Ontario al. this '23 day ofhay1907 ILLARDM. HARWOOD.

-Witnesses:

' J. C. HARWOO EVELYN A, HA WOOD.- 

